In a microwave-safe mug, combine the flour, sugar, cocoa powder, baking powder, and salt. Mix well to ensure there are no lumps.

Add the milk, vegetable oil, and vanilla extract to the dry ingredients. Stir until a smooth batter forms.

Gently fold in the chocolate chips, ensuring they are evenly distributed throughout the batter.

Place the mug in the microwave and cook on high for 60-90 seconds, or until the cake has risen and the center is set. Avoid overcooking to prevent dryness.

Let the mug cake cool for 1-2 minutes before serving. Enjoy directly from the mug or transfer to a plate if desired.